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Message-Id: <200911230121.40885@blacky.localdomain>
Date:	Mon, 23 Nov 2009 01:21:40 +0300
From:	"Nikita V. Youshchenko" <yoush@...msu.su>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Why processes on linux loses signals?

> In short, processes on linux loses signals.  It happens
> rarely, but it happens, and the frequency of this happening
> is enough to be annoying.
>
> ...
>
> The problem becomes much much worse when a system has multiple
> cores... But with even second core the issue emerges almost
> immediately ...

Looks like a classical race description.
Double-check your user-space code for signal-related races.
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